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Studies carried out on prenatal factors have shown that hormones and genes play crucial roles in sexual orientation. However, there are lots of barriers in our existing understanding of the prenatal factors that affect sexual differentiation. For instance, reports on the effect of embryonic endocrine problems on homosexuality have found a very restricted effect size. Further, the reviews on homosexuality have only involved a small proportion of subjects. Homosexuality has long been considered a mental sickness. In 1886, psychologists Richard von Krafft-Ebing listed sexual perversions as "sex-related mental disorders. " Sigmund Freud defined homosexuality as "a conflicted psychosexual development. " Other studies imply that the reason for homosexuality is not a single factor but a mixture of inborn elements and environmental impacts. There are a couple of elements linked to the genetic basis of sexual orientation, including the presence of older brothers. Having older brothers in the family considerably raises the probability of homosexuality. Each older brother has a 33% increase in the occurrence of homosexuality.
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26.01.2023